zsh v 2.6-beta13 bug (fwd)

[mason@werple.net.au]

:On:
:  HP-UX A.09.01 A 9000/715
:  IRIX 5.3 IP22 mips
:  SunOS 5.4 sun4d sparc
:In 'bindkey -v' mode, if I do the '~' command on an empty line,
:the cursor moves up to the first cursor of the line before the current
:line.  Instead, nothing should happen.

In viswapmode(), cs was being set to -1 (cs should always be >= 0) - should 
probably put a sanity check for this in zle_refresh.c but it may obscure
other bugs.

:Additionally, on HP, after doing that, I can sometimes crash zsh, if I do:
:1. '~' (as described above)
:2. 'j' 'k' 'j' 'k'... (until there's a beep)

?? You shouldn't get a beep on this sequence except when at the beginning/end
of your history list and the beep will be on the first 'k'/'j'.  So I assume
you mean lots of 'j's and 'k's until there's a beep (?)

:3. 'a' (add) ' ' (any character)  (a '^Q' suddenly appears on the command line)
:4. <CTRL>-'c' (break)
:zsh: 13975 bus error  zsh -f
:On SunOS, after step 4, the shell doesn't crash but instead freezes.

Even then, I couldn't replicate this second part on NetBSD.

Anyway, this should fix up the first problem.  Anyone who knows zle_vi.c
more than me (that's everyone), might want to validate this


*** zle_vi.c.bak	Tue Apr  2 11:42:26 1996
--- zle_vi.c	Tue Apr  2 11:42:26 1996
***************
*** 735,740 ****
--- 735,742 ----
      if (mult < 1)
  	return;
      eol = findeol();
+     if (cs == eol)
+ 	return;			/* empty buffer */
      while (cs < eol && mult--) {
  	if (islower(line[cs]))
  	    line[cs] = tuupper(line[cs]);


-- 
Mason [G.C.W]  mason@werple.mira.net.au    "Hurt...Agony...Pain...LOVE-IT"